I'm having an HVAC system designed for a commercial building. We have a meeting room, offices and front lobby. The mechanical engineer told me that we cannot use one unit for all areas and zone it since the meeting room can get hot when many people are in, while the lobby can get cold. So a single unit cannot serve both zones. This makes sense, but under this scenario we are going to have cooling on one room and heating on the next room. It sounds terribly inefficient.
Does anyone has a suggestion for a more efficient method?